<!-- 除登录页以外所有页面的父级页面,编写共有的左侧菜单栏与头部 -->
<template>
  <!-- 1.display: flex;给父容器使用弹性布局可以使所有子元素横置靠左排列 -->
  <div style="display: flex;">
    <!--2.isCollapse为true:折叠左侧菜单栏,左侧菜单栏宽度为64px,右侧主体宽度为calc(100% - 64px)-->
    <!--3.isCollapse为false:不折叠左侧菜单栏,左侧菜单栏宽度为208px,右侧主体宽度为calc(100% - 208px)-->
    <div :style="{ width:(isCollapse ? '64px' : '208px')}">
      <!-- 左侧菜单栏  -->
      <!-- :collapse="isCollapse"左侧菜单栏是否折叠交给isCollapse变量来控制  -->
      <!-- unique-opened只允许同时打开一项菜单项 router允许菜单项进行路由跳转 -->
      <!-- :collapse-transition="false" 去掉折叠的过渡,否则会感觉卡一下     -->
      <el-menu
          background-color="#3C82F5"
          text-color="#fff"
          active-text-color="#ff0"
          style="width:100%;height:100vh;"
          :collapse="isCollapse"
          unique-opened
          router
          :collapse-transition="false"
          @select="selectMenu"
      >
        <!-- 左侧菜单栏的顶部条  -->
        <el-row style="padding-top:10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 7px;">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13" >
            <router-link to="/"
            style="color:#fff;font-weight:bold;text-decoration:none;
            position:relative;top:8px;left:2px;">智慧车辆</router-link>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;"><User/></el-icon><span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size:21px;"><Van/></el-icon><span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">基本信息</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size:21px;"><Location/></el-icon><span>电子围栏</span>
          </template>
          <el-menu-item index="/geofence">围栏管理</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size:21px;"><Place/></el-icon><span>调度管理</span>
          </template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size:21px;"><MessageBox/></el-icon><span>数据字典</span>
          </template>
          <el-menu-item index="/dict">字典管理</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{ width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!-- 顶部菜单栏   -->
      <el-header style="height:10vh;background-color:#fff;padding-top:22px;">
        <el-row :gutter="10">
         <el-col :span="18">
           <el-icon style="font-size:20px;" @click="changeCollapse"><Expand/></el-icon>
         </el-col>
         <el-col :span="6" style="position: relative;">
           <el-dropdown trigger="click" style="position: absolute;right: 20px;">
              <span style="font-size:19px;font-weight: bold;">
                {{user.username}}
                <el-icon><arrow-down/></el-icon>
              </span>
             <template #dropdown>
               <el-dropdown-menu>
                 <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
               </el-dropdown-menu>
             </template>
           </el-dropdown>
         </el-col>
        </el-row>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/" style="position:relative;top:20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!-- 右侧主体内容:除了顶部条与面包屑之外的可变区域,其他具体内容在子页面中写! -->
      <el-main style="height:90vh;padding:0;overflow-y: auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>
<script setup>
import {ref} from "vue";
//定义变量控制菜单是否折叠
const isCollapse = ref(false);
//定义修改菜单栏折叠状态的方法
const changeCollapse = () => {
  isCollapse.value = !isCollapse.value;
}
//获取当前登录的用户对象
const user = ref(getUser());
//定义当前面包屑数组的显示值
const breadcrumb = ref(
    JSON.parse(localStorage.getItem('breadCrumb')) || ['用户管理','用户列表']);
//定义集合用来维护页面路径与面包屑的对应关系
let map = {
  "/user":['用户管理','用户列表'],
  "/vehicle":['车辆管理','基本信息'],
  "/geofence":['电子围栏','围栏管理'],
  "/application":['调度管理','申请列表'],
  "/audit":['调度管理','调度审核'],
  "/distribute":['调度管理','车辆分配'],
  "/dict":['数据字典','字典管理']
};
//只要选择了菜单项,就切换面包屑的值
const selectMenu = (index)=>{
  breadcrumb.value = map[index];
  //解决面包屑丢失问题:每次切换页面时,将当前页对应的面包屑值存入localStorage中
  localStorage.setItem('breadCrumb',JSON.stringify(breadcrumb.value));
}

//定义退出登录功能
const logout = () => {
  if(confirm("是否退出登录?")){
    //清空存的用户数据+面包屑数据
    localStorage.removeItem('user');
    localStorage.removeItem('breadCrumb');
    //跳转至登录页
    window.location.href = '/login';
    //也要把已经取出来的user数据清空
    user.value = '';
  }
}


</script>
